change log level of exceptions with Arakoon.E_NOT_FOUND and Arakoon.E_ASSERTION_FAILED from Error to Debug
Merge branch '1.4' into 1.4-for-1.5

* 1.4:
  change log level of exceptions with Arakoon.E_NOT_FOUND and Arakoon.E_ASSERTION_FAILED from Error to Debug

Conflicts:
	src/client/client_protocol.ml